 Ayatollah Sadeq Larijani wrote works in a variety of different fields such as Islamic jurisprudence ("fiqh"), principles of Islamic jurisprudence ("Uṣūl al-fiqh"), analytic philosophy, philosophy of language, and moral philosophy.He also translated some works into Persian, notably Geoffrey Warnock's "Contemporary Moral Philosophy".He also translated a philosophy of science article by Karl Popper.